Apparatus for sizing or volumetric grading materials.



APPLI 0N FILED MARJO,

1, 1 2?,469, Patented Feb. 9, 1915.

3 SHEETS-SHEET 1.

K) fiwemfozw. r, myzaw/ G. L. MOKESSON & B. F. RICE. APPARATUS FOR SIZING 0R VOLUMETRIG GRADING MATERIALS.

APPLICATION FILED MAR. 10, 1914.

Patented Feb. 9, 1915.

3 SHEETS-SHEET 2.

m M w j THE NORRIS PETERS C0,. PHOTO-LITHQ. WASHING TON, L.

G. L. MOKESSON & B. F. RICE.

APPARATUS FOR SIZING OR VOLUMETRIG GRADING MATERIALS.

APPLIGATION FILED MAR. 10, 1914.

1, 1 27,469. Patented Feb.9, 1915.

3 SHEETS-SHEET 3.

THE NORRIS PETERS CO.. PHOTCJJTHQ. WASHINGTUN. D. C.

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APPARATUS SIZING OB VOLUMETRIC GRADING MATERIALS.

Specification of Letters Patent,

Patented Feb. 9, 1915..

Application filed March 10, 1914. Serial No. 823,732

To aZZ whom it may concern:

Be it known that we, CRAnLns L. Mc- Knsson, and BENJAMIN F. RICE, both citi-, zone of the United States, residing at Colorado Springs, in the county of El Paso and State of Colorado, and Denver, in the county of Denver, State of Colorado, respectively, have invented certain new and useful Improvements in Apparatus for Sizing or Volumetric Grading of Materials; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to apparatus for sizing or grading solidmaterials, and has for its object the provision of an apparatus ofthis character having thev same fundamental principlesof operation as the sizing apparatus disclosed in our prior Patent No. 1,044,067, issued November 12, 1912, but embodying the improvements hereinafter described.

The invention consists in so shaping the separating decks that the construction, as illustrated in said patent, is greatly simplilied, although the same principles of operation which are responsible for the high efficiency of said construction areretained.

The invention is illustrated in the accompanying drawings, in which,

Figure 1 is a perspective view of a sizing apparatus provided with the novel form of separating decks; Fig. 2 is a sectional view taken on the line 22 of Fig. 1; Fig. 3 is a sectional view taken on line 33-of Fig. 1; Figs. 4 and 5 are diagrammatic views showing the curvature'of the upper and lower portions respectively of the separating decks.

Referring to the drawings, in which like reference characters refer to corresponding parts, the character A desi nates the general supporting structure of the separator, and B the head motion employed to impart recinrocatory motion to the separating decks.

The separating decks to which this invention relates are designated generally bv the reference character C. Any desired number of such decks may be used, it being convenient, when more thanone are used,

to mount the same in superposed relation,

as shown inFigs. '1, 2 and 3. E T he inner end of each deck is supported at a higher level than the outer end thereof, in orderto incline the deck laterally.

in the prior patent above referred to, it was explained that if a body of unsiZed material be placed upon an inclined surface and pro iecting pulsations imparted to the surface in the same general direction as the inclination thereof, the smaller particles will he forced up the incline by the projecting pulsations, but the larger particles will not. This is due to the fact that the component of gravity acting on the particles and tending to prevent them from traveling up the incline is greater in the case of the larger particles. Tfthe projecting pulsations are greater than the component of gravity acting on any particle, the said particle will therefore travel up the incline. By giving the aforesaid inclined surface substantial length andxbreadth and inclining the surface in a lateral direction, a gradation of the particlesof the material may be obtained, due to the fact that the smaller particles will travel in more direct paths longitudinally of the surface than the larger particles, since the larger particles cannot travel up the incline and will be forced to take a path down the lateral incline and report at the lower lateral edge of the surface.

The construction of the present separating decks is basedupon the foregoing principle. The decks are curved, as clearly shown in Figs. 1, 2 and 3, and are so mount,- ed that the inclination thereof gradually increases toward the rear edge. The curvature at the top and bottom of each deck is substantially the same, said curvature corresponding to the arc of a circle. The are represented bythe lower edge ofthe deck from point 0 to point 0 is the same as the are from point 0 to point 0, but the point 0 is nearer to a vertical line passed through the center of its arc than the point e, as exemplified in Figs. a and 5. In these figures, Drepresents the centers of the arcs, and that portion of the are from d to CF in Fig. l represents the eolgec to c of the deck. The are (Z to (Z in Fig. 5 represents the edge 0 to 0 and it will be noted that the distance from the center I) to the vertical line passed through the point (Z is greater than the distance from the center D to the vertical line passed through the point (Z It follows fromthis construction that the Q chords of the two arcs are oblique to each other and are inclined with respect to the longitudinal axis of the machine, the inclination of the chord of the upper are being greater than the inclination of the chord of the lower arc.

The inclination from c to 0 gradually increases, the increase being greater for any given distance than from of to 0. This is clearly shown in F igs. 2 and 3,.in which Fig. 2 represents a section taken at the-upper end of the separating decks, and Fig. 3

represents a section taken at the lower end of the decks. It will be noted that the distance o to 0 (F ig.2) is greater than the distance 0 to a (Fig. 3) showing that the inclination of the decks at the top thereof is greater than at the bottom. The surface of the separating decks is preferably provided with corrugations 0r ridges E. Unsized material is fed to the decks by the hoppers F which distribute an equal amount of the material to the several decks.

A differential reciprocating motion is imparted to the decks by the head motion B, as described in our prior Patent, No. 1,044,067, and due to the special shape of the decks, the material is graded and sized by the same principles of operation as outlined in the aforesaid patent, in which a plurality of deflectors are employed on the separating deck presenting incllned surfaces of successively increasing pitch or inclination to the material. In the present case, as the deck gradually increases in inclination toward the rear edge, the separate deflectors maybe dispensed with. The material introduced by the hoppers immediately encounters an upgrade, which grade or inclination gradually increases as the material progresses under the action of the projecting pulsations, due to the differential reciprocation motion imparted to the decks. Particles which are large enough to cause the component of gravity to balance the projective force will immediately start in a downward direction, due to the fact that the projective force is not sufficient to cause said particles to travel up the incline. The largest particles will travel in a straight-line along the edge 0, c of the deck and directly toward the lower edge of the deck, since the inclination at all points in the length of the deck will be suflicient to prevent said particles from making any progress toward the edge 0 c. Particles of slightly less size will also be retarded I report. Continued application of this princorner 0.

Particles which are sufliciently small to travel up the incline at the edge 0 0 will pursue a path directly across the deck, since the effective projective force is much greater than the two components of gravity,one tending to move the particle down the incline toward the edge 0, 0 and the other tending to prevent the particle from passing up the incline along the edge c, 0 The next larger particles will be acted upon to a greater extent by the component of gravity tending to make the same move down the incline toward the lower edge 0', c and furthermore, said particles will have to move farther from the edge 0 0 than the aforesaid smallest particles until they reach an incline up which they can be forced by the projective impulses. The said next larger particles will therefore report at a point'along the edge 0 0 adjacent the point at which the smallest particles reported, said point being nearer to the corner 0. By applying this principle to particles of successively increasing size, it willbe seen that a.

gradation of the particles is obtained along the edge 0 c, as well as along the edge 0, 0 the smallest particles reporting near point 0 and successively larger particles reporting at various points along the edge The cutters for separating the sized material at the edges of the decks have been omitted fromv the drawings, for the sake of clearness. Said cutters may be the same in construction, however, as those disclosed in our prior patent hereinbefore referred to. 7 What we claim is V 1. In a machine for-sizing solid materials, a laterally inclined separating deck presenting a. surface curved in a longitudinal direction to conform at its upper and lower edges to arcs of a circle, the chords of said arcs being inclined to the longitudinal axis of the machine and the chord of the upper edge being of greater inclination than that of to the deck.

2. In a' machine for sizing solid materials,

a laterally inclined separating deck presenting a surface curved in a longitudinal direction to conform at its upper and lower edges to arcs of a circle, the chords of said arcs being oblique to each other, and means to feed material tothe deck.

3. In a machine for sizing solid materials, a laterally inclined separating deck having its upper and lower edges inclined upwardly from the front to the rear of the machine, the inclination of the upper edge being greater than that of the lower edge, and means to feed material to the deck at the upper front corner thereof.

l. In a machine for sizingsolid materials, a laterally inclined separating deck having its upper and lower edges inclined upwardly from the front to the rear of the machine, the inclination of the deck gradually decreasing from the upper edge thereof toward the lower edge, and means to feed material to the upper front corner of the deck.

5. In a machine for sizing solid materials,

a laterally inclined separating deck having its upper and lower edges inclined upwardly from the front to the rear of the machine, and gradually increasing in inclination from the front to the rear of the machine, the inclination of the upper edge being greater than that of the lower edge.

In testimony whereof we affix our signatures, in presence of two witnesses.

CHARLES L. MCKESSON. BENJAMIN F. RICE. Witnesses:

B. A. BRIGGS, A. J. LAWTON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

